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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02000635920e6a8b09ad8024caba5dff72a1da0ec213a47f371fcb675132e812' 
  AND token = 'cvMTrVZCqfJ5nyUBVg1Q8wmy1suvcuA/rzs5N18eaiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}